WO2016132402A1 - Dispositif de transfert de trames de communication et système de communication - Google Patents

Dispositif de transfert de trames de communication et système de communication Download PDF

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Publication number
WO2016132402A1
WO2016132402A1 PCT/JP2015/000828 JP2015000828W WO2016132402A1 WO 2016132402 A1 WO2016132402 A1 WO 2016132402A1 JP 2015000828 W JP2015000828 W JP 2015000828W WO 2016132402 A1 WO2016132402 A1 WO 2016132402A1
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Prior art keywords
frame
low
delay
transmission
communication
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PCT/JP2015/000828
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English (en)
Japanese (ja)
Inventor
礼子 井上
善文 堀田
浩資 別所
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2015/000828 priority Critical patent/WO2016132402A1/fr
Priority to TW104110391A priority patent/TWI555358B/zh
Publication of WO2016132402A1 publication Critical patent/WO2016132402A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/44—Star or tree networks

Definitions

  • the present invention relates to a communication frame transfer device for transferring a communication frame transmitted from a communication device on a transmission side to a communication device on a reception side, and a communication system using the communication frame transfer device.
  • Ethernet registered trademark
  • a communication frame that handles device control information
  • a communication frame information system frame
  • control system frames have strict delay requirements
  • communication frame transfer apparatuses are required to have low delay transfer according to the characteristics of the communication system.
  • a communication frame that requires low-delay transfer such as a control frame, that is, a communication frame with a short allowable delay time is called a low-delay frame.
  • a frame such as an information frame that has a longer allowable delay time than a low-delay frame or that does not require a delay time is called a normal frame.
  • the assumed application is the same when there are a plurality of low-delay frames, that is, the priorities are the same, and the time zone in which the low-delay frames arrive is known. .
  • the cycle of the low delay frame inputted to each port is different.
  • the priority of low-delay frames differs depending on the type of application, and high-priority frames (hereinafter referred to as high-priority frames) that have severe delay requirements on the order of ⁇ s, and delays that are relatively loose compared to high-priority frames.
  • high-priority frames high-priority frames
  • low priority frame there is a problem that the low-delay frames compete with each other at the transmission port, the output of the high-priority frame is awaited by the low-priority frame, and the delay request cannot be satisfied.
  • the present invention has been made to solve the above-described problem, and performs output control based on frame priority when a plurality of low-delay frames having different frame priorities compete at the same transmission port,
  • An object of the present invention is to obtain a communication frame transfer apparatus that realizes low-delay transfer that satisfies the delay requirement of a low-delay frame.
  • a communication frame transfer device is connected to a plurality of communication devices, and transmits a normal frame transmitted from the communication device and a plurality of low delay frames set with different frame priorities to another communication device.
  • a transfer device that has a plurality of reception ports that receive normal frames and low-delay frames from a communication device, and searches for transmission ports to which low-delay frames received by the receiver are transmitted.
  • Destination search unit that extracts the frame priority, a transmission queue that stores low-delay frames according to the transmission port searched by the destination search unit and the received reception port, and reception time when the low-delay frame is received
  • the output order of low-delay frames is determined based on the frame priority and reception time of low-delay frames.
  • the read queue management unit and the output order determined by the read queue management unit read out the low-delay frame from the transmission queue and transmit it to another communication device, and the low-delay frame is not stored in the transmission queue. And a transmitter for transmitting a normal frame to another communication device.
  • the communication system includes a plurality of communication devices, a normal frame transmitted from the communication device, and a plurality of low-delay frames set with different frame priorities.
  • a communication frame transfer device for transferring to a device the communication frame transfer device having a receiver having a plurality of reception ports for receiving normal frames and low-delay frames from the communication device, and received by the receiver Searches the transmission port to which the low-delay frame is transmitted, and extracts the frame priority of the low-delay frame, the destination search unit, and the low-delay frame according to the transmission port searched by the destination search unit and the received reception port
  • the transmission queue to store and the reception time when the low-delay frame is received is calculated, and the frame of the low-delay frame is calculated.
  • a read queue management unit that determines the output order of low-delay frames based on priorities and reception times, and another communication device that reads low-delay frames from the transmission queue based on the output order determined by the read queue management unit And a transmitter that transmits a normal frame to another communication device when a low-delay frame is not stored in the transmission queue.
  • the output control based on the frame priority is performed, and the low delay transfer satisfying the delay request of each low delay frame Can be realized.
  • FIG. 1 is a block diagram illustrating a configuration of a communication system according to the present embodiment.
  • devices with the same number represent the same or the same type of device, and multiple devices of the same type in the communication system have a “ ⁇ ” after the number.
  • the communication device 2-1 When the devices and the like are generically referred to or not distinguished from each other, description will be made using “ ⁇ ” and a code without a number attached after that (for example, reception MAC unit 11).
  • the communication system 1 includes a plurality of communication devices 2-1 to N (N is an integer of 2 or more), and each is connected via a communication path 3 and a communication frame transfer device 4.
  • the communication device 2 here is a communication device such as a communication terminal, and may be any device that can transmit or receive a communication frame.
  • the communication path 3 is a transmission path capable of transmitting an optical signal or an electrical signal, such as an optical fiber or a coaxial cable, and may be a wireless path.
  • a communication frame having a short allowable delay time such as a control frame
  • a communication frame such as an Express frame
  • a communication frame such as an information-related frame that has a longer allowable delay time than a low-delay frame or that does not require a delay time
  • a normal frame a communication frame such as an information-related frame that has a longer allowable delay time than a low-delay frame or that does not require a delay time
  • a normal frame is referred to as a normal frame in the following description.
  • multiple frame priorities are set for low-delay frames, and low-delay frames with high delay priority that have stricter delay requirements are designated as high-priority frames.
  • Loose low-delay frames are designated as low priority frames.
  • FIG. 2 shows a block diagram of the configuration of the communication frame transfer apparatus 4.
  • the communication frame transfer apparatus 4 includes a receiver 10, a transmitter 20, an Express transmission queue 30-1 to N, a normal transmission queue 40-1 to N, a read queue management unit 50, a destination search unit 60, a destination port allocation. It consists of dividing parts 70 and 71.
  • the receiver 10 has a plurality of reception ports, and reception MAC (Media Access Control) units 11-1 to 11-N are provided for each reception port.
  • the reception MAC unit 11 is connected to each of the communication devices 2-1 to N shown in FIG. 1 and includes both an Express frame and a Normal frame defined by the standard related to IET (Interspersing Express Traffic) transmitted from the communication device 2.
  • the received traffic is received, distributed internally to an Express frame and a Normal frame, and output to different paths. Further, when receiving the Express frame, the reception MAC unit 11 outputs an Express reception trigger to notify the read queue management unit 50 that the Express frame has been received.
  • the transmitter 20 has a plurality of transmission ports, and transmission MAC units 21-1 to 21-N are provided for each transmission port.
  • the transmission MAC unit 21 is connected to each of the communication devices 2-1 to N shown in FIG. 1, and outputs traffic in which an Express frame and a Normal frame are mixed.
  • the reception port and the transmission port having the same port number are connected to the same communication device 2, for example, the reception port 1 (reception MAC unit 11-1) and the transmission port 1 (transmission MAC unit 21- 1) is assumed to be connected to the communication device 2-1. Therefore, here, it is assumed that there is no communication frame transferred from the reception port having the same port number to the transmission port.
  • the reception MAC units 11-1 to 11-N and the transmission MAC units 21-1 to 21-N have an IET function that is being standardized by IEEE 802.3br, and can transfer an Express frame to a normal frame by interrupt.
  • the reception MAC units 11-1 to 11-N distribute communication frames in which Express frames and Normal frames are mixed into Express frames and Normal frames, and output them from different paths.
  • the transmission MAC unit 21 interrupts the output of the Normal frame and preferentially outputs the Express frame. This makes it possible to perform frame transfer that satisfies the Express frame delay requirement.
  • the normal frame is divided when the interrupt of the Express frame is generated by using the IET function. However, after the transfer of the Express frame is completed, the untransmitted part is transferred and the Normal frame is divided in the communication apparatus on the receiving side. By combining these, the normal frame can be reproduced.
  • the communication frame transfer apparatus 4 includes Express transmission queues 30-1 to 30-N that store Express frames and Normal transmission queues 40-1 to 40N that are storage devices that store Normal frames.
  • the Express transmission queues 30-1 to 30-N are connected to the destination port distribution unit 70, and have dedicated queues 31-1-2 to 31-N- (N-1) corresponding to the respective reception ports. Then, the Express frame output from the destination port allocating unit 70 is stored in each dedicated queue 31 according to the reception port from which the Express frame is received. In this way, it is possible to store the Express frame according to the transmission port to which the Express frame is transmitted and the received reception port.
  • the Express transmission queue 30 includes a number of dedicated queues corresponding to the reception port and the transmission port, and in a communication frame transfer apparatus having N reception ports and transmission ports as shown in FIG. There are N ⁇ (N ⁇ 1) dedicated queues.
  • N ⁇ (N ⁇ 1) dedicated queues As described above, it is assumed that there is no communication frame transferred from the reception port having the same port number to the transmission port. Therefore, the reception port having the same port number is set in the Express transmission queue 30 provided for each transmission port.
  • a corresponding dedicated queue 31 is not provided.
  • the dedicated queue 31-1-1 corresponding to the reception port 1 is not provided in the Express transmission queue 30-1 of the transmission port 1.
  • the Express transmission queue 30 here may be a storage device that can store and read the transmission port to which the Express frame is transmitted and the received reception port in association with each other.
  • the destination of the Express frame received at the reception port 1 is the transmission port 2 (transmission MAC unit 21-2)
  • this Express frame is sent to the Express queue 30- of the transmission port 2.
  • 2 is stored in the dedicated queue 31-2-1 of the receiving port 1.
  • the dedicated queue 31 for each reception port can perform cut-through output. By receiving a control signal for performing cut-through transfer from the transmission MAC unit 21, it is not stored in the transmission port Express transmission queue. It can be transferred as it is.
  • the normal transmission queues 40-1 to 40-N are storage devices that are connected to the destination port allocating unit 71 and temporarily store normal frames transmitted from the destination port allocating unit 71. Further, N normal transmission queues 40 are provided corresponding to the respective transmission ports. The normal frames are stored in the normal transmission queues 40-1 to 40-N in the order of arrival, and the normal frames are output to the transmission MAC units 20-1 to 20-N based on the control signals from the transmission MAC units 20-1 to 20-N.
  • the read queue management unit 50 is provided after the reception MAC unit 11 and performs priority output control of an Express frame received by the reception MAC unit 11. That is, reception time information and frame priority information of an Express frame received by the reception MAC unit 11 are acquired, and in what order the Express frame is output from the transmission port is determined based on these information.
  • the read queue management unit 50 can perform control for each transmission port, and in order to perform appropriate priority output control, the reception port dedicated queue 31 in the Express transmission queue 30 to be read next by the transmission MAC unit 21. Is sent to the transmission MAC unit 21.
  • the read queue management unit 50 includes a time information management unit 51, a frame priority management unit 52, and a read queue determination unit 53.
  • the time information management unit 51 and the frame priority management unit 52 store and manage information related to the time at which the reception MAC unit 11 receives the Express frame and the priority of the received Express frame, respectively. Further, the read queue determination unit 53 determines the priority output control of the transmission MAC unit 21, that is, the output order of the Express frames to be output based on these pieces of information.
  • FIG. 3 shows a detailed configuration diagram of the read queue management unit 50.
  • the time information management unit 51 includes a time information counter 510 and registers 511-1 to 511-1 corresponding to the respective reception ports, and a reception trigger sent from the reception MAC unit 11 and time information sent from the time information counter 510. Based on the above, the reception time information of the Express frame is calculated and stored in the register 511 for each reception port.
  • the frame priority management unit 52 includes priority management units 520-1 to 520 -N for managing the priority information of the Express frame for each reception port.
  • the priority management unit 520 holds the priority information of the Express frame received by the reception MAC unit 11 for each reception port based on the priority information of the Express frame output from the destination search unit 60.
  • the read queue determination unit 53 includes a reception time comparison unit 531, a priority comparison unit 532, and a read queue determination calculation unit 533.
  • the reception time comparison unit 531 reads the reception time information stored in the registers 511-1 to 51-1, and compares the difference in reception time between a plurality of Express frames output from the same transmission port with a threshold value to be described later.
  • the priority comparison unit 532 reads the priority information held by the priority information management unit 520, and compares the priority among a plurality of Express frames output from the same transmission port.
  • the read queue determination calculation unit 533 determines the output order of the Express frames at each transmission port based on the comparison results in the reception time comparison unit 531 and the priority comparison unit 532, and then determines which of the Express transmission queues. It is determined whether the Express frame is read from the reception port dedicated queue. After making these determinations, the transmission MAC unit 21 is notified of the determined read queue number.
  • the destination search unit 61 extracts the destination information (MAC destination address) of the frame from the Express frame and the Normal frame output from the reception MAC unit 11, determines a transmission port to be output based on the destination information, and determines this determination.
  • the transmission port information of the Express frame is transmitted to the read queue management unit 50.
  • the destination search unit 61 extracts priority information from the Express frame output from the reception MAC unit 11 and transmits it to the read queue management unit 50 together with the transmission port information.
  • the destination search unit 61 outputs an Express frame and a Normal frame to the destination port sorting unit 70 and the destination port sorting unit 71, respectively.
  • the destination port allocating units 70 and 71 distribute the Express frame and the Normal frame to the Express transmission queues 30-1 to 30-N or the normal transmission queues 40-1 to 40-N corresponding to the transmission ports determined by the destination search unit 60, respectively. .
  • FIG. 2 an Express frame and a Normal frame are mixedly input to the communication frame transfer apparatus of the present invention.
  • operations of the Express frame and the Normal frame will be described separately.
  • the destination search unit 60 that has received the Express frame from the reception MAC unit 11 extracts destination information included in the Express frame, and determines a transmission port to be output based on the destination information. Information regarding the determined transmission port (transmission port information) and priority information extracted from the Express frame (frame priority information) are output to the read queue management unit 50. In addition, the destination search unit 60 outputs the received Express frame to the destination port distribution unit 70.
  • the read queue management unit 50 operates for each transmission port and performs priority output control of the Express frame. Details of the operation will be described below.
  • FIG. 4 shows a priority output control flow of the Express frame in the read queue management unit 50.
  • the time information management unit 51 in the read queue management unit 50 uses the time information from the time information counter 510. Based on the above, the time when the reception trigger is received is acquired as the frame reception time of the Express frame. Further, the acquired frame reception time is stored in the register 511 corresponding to the reception port that has received the Express frame (step S102).
  • the read queue management unit 50 acquires the transmission port information and frame priority information of the Express frame output from the destination search unit 60, and stores them in the priority management unit 520 corresponding to the reception port that has received the Express frame ( Step S103).
  • the frame priority information is information indicating the priority class of the Express frame when different classes of priority are provided for a plurality of types of Express frames.
  • different allowable delay times are set for different frame priority classes, and the higher the frame priority, the shorter the allowable delay time. It should be noted that even an Express frame in which the same allowable delay time is set, a different frame priority may be set, and either one may be preferentially output from the transmission port.
  • the number of frame priority classes is not limited, and the present invention can be applied to two or more classes.
  • the read queue management unit 50 determines whether Express frames compete with each other at the same transmission port using the reception time and transmission port information of each Express frame. (Step S104).
  • the read queue management unit 50 determines that a plurality of Express frames satisfy a predetermined condition and is received by the reception MAC unit 11 and these Express frames compete with each other (Yes in step S104)
  • the read queue management unit 50 determines which reception port the Express frame input from is preferentially output.
  • the read queue management unit 50 notifies the transmission MAC unit 21 of the reception port number of the output frame, that is, the read queue number in the Express transmission queue 30.
  • the calculation flow is shown in FIG.
  • step S104 determines that there is no contention between Express frames at the transmission port. If the read queue management unit 50 determines that there is no contention between Express frames at the transmission port (step S104: No), the Express frames are output in order of reception time (step S106).
  • a method for determining whether or not there is an Express frame conflict in step S104 will be described.
  • the predetermined condition refers to a case where a difference between reception times of a plurality of Express frames is within a certain time, and a user or the like can determine the time according to the priority of the Express frame. For example, when no output control is performed, an Express frame output from the same transmission port is received with a time difference such that an Express frame collides. Even if there is no collision, the user can set a case where a plurality of Express frames have a specific priority and are equal to or less than a certain reception time difference.
  • FIG. 5 shows a calculation flow of the read queue determination unit 513.
  • the read queue management unit 50 receives the Express frame at the reception MAC unit 11, passes through the time required for destination search and destination port allocation, and other processing time until the frame reaches the Express transmission queue 30.
  • the total time (transfer delay time) is held, and this transfer delay time becomes a threshold value to be described later.
  • This transfer delay time may differ depending on the reception port from which the Express frame is received and the transmission port to which the Express frame is transmitted.
  • the transfer delay time includes a delay time required for processing in each device through which an Express frame such as the destination search unit 60 or the transmission queue passes.
  • step S104 it is determined whether or not the difference in the reception times of the Express frames determined to cause competition is smaller than this threshold (step S201).
  • step S201 If the difference in the reception times of the Express frames competing in step S201 is smaller than the threshold value, the high priority frame can be output first even if the high priority frame arrives later than the low priority frame.
  • the order is controlled (step S201: Yes). Otherwise (step S201: No), the competing Express frames are output in the order of reception time (step S204).
  • step S202 the priority of competing frames is compared.
  • the priority of the late-arrived Express frame (late-arrival frame) is higher than the priority of the early-arrival Express frame (first-arrival frame)
  • the order of output is changed, and the late-arrival frame is set as the next output frame.
  • frames with the same priority it is assumed that the user can determine which receiving port outputs a frame input preferentially. For example, among the competing Express frames, an Express frame received from a younger receiving port is selected as the next output frame, an Express frame received from a receiving port with a lower output count is selected as the next output frame, etc. is there.
  • the read queue management unit 50 notifies the transmission MAC unit 21 of the reception port number of the next output frame determined in step S202 as the read queue number in the transmission queue.
  • the transmission MAC unit 21 reads the Express frame from the dedicated queue 31 with the notified number, and transmits it to the communication device 2 connected to the own device.
  • the maximum allowable delay time of the low-priority frame time that can stay in the transmission queue
  • the transmission queue is monitored from the transmission MAC unit 21, and the frame that stays in the transmission queue exceeding the maximum allowable delay time is low. Control may be performed so that priority frames are output with priority. Thereby, transfer within the maximum allowable delay time can be controlled more appropriately.
  • the destination search unit 60 determines the transmission port to be output from the frame destination information.
  • the destination port allocating unit 70 uses the transmission port information determined by the destination search unit 60 to send the Express frame received from the destination search unit 60 to the receive port dedicated queues 31 of the Express transmission queues 30-1 to 30-N. To do.
  • the transmission MAC unit 21 sends a control signal to the Express transmission queues 30-1 to 30-N according to the read queue number information notified from the read queue management unit.
  • the Express transmission queue 30 outputs an Express frame from each reception port dedicated queue based on the control signal.
  • the transmission MAC unit 21 outputs the Express frame output from the Express transmission queue 30 to the communication device 2 to which the frame is connected based on the IET transfer method.
  • the destination search unit 60 searches for the destination port as in the case of the Express frame.
  • the destination search unit 60 transfers the received normal frame to the destination port distribution unit 71.
  • the destination port allocating unit 71 that has received the normal frame stores the destination frame in one of the normal transmission queues 40-1 to 40 -N for each transmission port, using the destination search result in the destination search unit 60.
  • the transmission MAC unit 21 transfers the Normal frame if the Express frame is not being transferred by the IET transfer method. That is, the transmission MAC unit 21 outputs a control signal to the normal transmission queue 40 unless the Express frame is being transferred.
  • the normal transmission queue 40 outputs the normal frame to the transmission MAC unit 21 from the normal transmission queue 40 instructed based on the control signal.
  • the normal frame output control method can be determined by the user.
  • the normal frame is output by a method such as transfer from a young port, transfer by absolute priority control, or selection of a reception port number with a low output count.
  • the output order of the Express frame when the communication system and the communication frame transfer apparatus according to Embodiment 1 of the present invention are used will be described with reference to FIG. As shown in FIG. 6, it is assumed that the Express frame is input in the order of priority (high) to the reception port 2, priority (low) to the reception port n, and priority (medium) to the reception port 1. . Although these frames are in a contention relationship, in the conventional communication system, as shown in the upper part of FIG. 6, the order of input to each receiving port, that is, priority (high), priority (low) ) And in order of priority (medium).
  • the communication system and the communication frame transfer apparatus in the relationship between the priority (high) input to the reception port 2 and the priority (low) input to the reception port n, Since the first frame has a higher priority, the output order is not changed, but the relationship between the priority input to the reception port n (low) and the priority input to the reception port 1 (medium) is Since the arrival frame has a higher priority, the express frame of the priority (medium) input to the receiving port 1 which is the later arrival frame is output first by the processing of step S203 and step S203 shown in FIG. It becomes. Therefore, as shown in the lower part of FIG. 6, the output order of the priority (low) input to the reception port n and the priority (medium) input to the reception port 1 is switched, and the low delay frame satisfying the delay request Transfer is possible.
  • the receiver and transmitter that constitute the communication frame transfer apparatus 4 include a communication module, and a memory, a processor, and the like are provided as necessary.
  • the receiver and the transmitter are described separately, but they may be integrated.
  • Other configurations of the read queue management unit 50 and the like can be realized by using logic ICs such as FPGA (Field Programmable Gate Array) that is a general-purpose IC and ASIC (Application Specific Specific Integrated Circuit) that is an application specific IC. .
  • logic ICs such as FPGA (Field Programmable Gate Array) that is a general-purpose IC and ASIC (Application Specific Specific Integrated Circuit) that is an application specific IC.
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Specific Integrated Circuit
  • the logic IC includes a processor, a memory, and an input / output interface circuit as shown in FIG.
  • the signal input from the input / output interface circuit may be processed by the processor executing the program stored in the memory and output from the input / output interface circuit.
  • the frame priority information is extracted immediately after the reception MAC unit, so that the frame is received and arrives at the transmission queue. Using the time, the next read queue in the transmission MAC unit can be determined. Therefore, even if an Express frame competes, an Express frame having a high priority can be cut-through output, and a low-delay frame transfer that satisfies a delay request is possible.
  • the Express frame transmission queue is basically cut-through transfer, but when Express frames compete with each other on the same transmission port, the low-priority Express frame is stored in the transmission queue until the transfer of the high-priority Express frame is completed. However, it can be read and transferred after the transfer of the high-priority Express frame is completed (store-and-forward format).
  • FIG. 8 and 9 are block diagrams showing configurations of the Express transmission queue 30 and the read queue management unit 50 according to Embodiment 2 of the present invention, respectively. Other configurations are the same as those in the first embodiment, and a description thereof is omitted.
  • the Express transmission queue 30 is further prioritized in the dedicated queues 31-1-2 to 31-N- (N-1) for each reception port in the Express transmission queues 30-1 to 30-N for each transmission port.
  • Dedicated queues 32-1-2-1 to 32-N- (N-1) -2 are provided for each degree.
  • the Express frame is stored in one of the dedicated queues 32-1-2-1 to 32-N- (N-1) -2 according to the transmission port, the reception port, and the priority. That is, the reception port of the receiver, the transmission port of the transmitter, and the number of dedicated queues corresponding to the number of priority classes are provided, the transmission port searched by the destination search unit 60, the received reception port, and the low delay frame Can be stored in a dedicated queue in accordance with the priority.
  • dedicated queues 521-1 to 52N-2 for each priority level are provided in each priority level management unit 520 provided for each reception port in the frame priority level management unit 52. Yes.
  • This dedicated queue manages the frame priority of the input Express frame for each reception port (managed by the frame priority management unit 520) and for each priority class (managed by the dedicated queue 521 for each priority).
  • the priority arrival information management units 54-1 to 54-N indicate information indicating whether or not priority information exists from the priority dedicated queue 521 (hereinafter referred to as priority arrival information). Enter 1 to N.
  • the priority arrival information management unit notifies the read queue determination unit 53 of the priority of the highest priority of the priority arrival information and the reception port number.
  • the reception MAC unit 11 of the received reception port When an Express frame is input to the communication frame transfer device 4, as in the case of the first embodiment, the reception MAC unit 11 of the received reception port outputs an Express trigger to the read queue management unit 50, and the read queue The management unit 50 acquires the reception time information and transmission port information of the Express frame.
  • step S204 shown in FIG. 4 it is determined whether or not there is contention not only for the Express frames received from different receiving ports but also for a plurality of Express frames received from the same receiving port.
  • the predetermined conditions for contention are the same as in the case of the first embodiment. For example, the first arrival frame that is output from the same transmission port as the first arrival frame after the arrival of the first arrival Express frame is received. Whether or not an Express frame has been received.
  • step S204 the difference between the reception times of the competing Express frames and the transfer delay time are compared in the same manner as in the first embodiment. If this difference in reception time is smaller than the transfer delay time, output control is performed.
  • the priority dedicated queue 521 displays information on whether or not priority information exists inside (hereinafter referred to as priority arrival information) as priority arrival information management units 54-1 to N. To enter.
  • the priority arrival information management unit 54 notifies the read queue determination unit 53 of the priority of the Express frame having the highest priority among the Express frames of the priority for which the priority arrival information is set, and the reception port number.
  • the read queue determination unit 53 compares the priority information between the reception ports and sets the frame with the highest priority as the next output frame.
  • the transmission MAC unit 21 is notified of the reception port number and priority information of the next output frame.
  • the transmission MAC unit 21 outputs a control signal to the Express transmission queue 30 based on the notified information.
  • the Express transmission queue 30 outputs an Express frame based on the control signal.
  • the communication device and the communication frame transfer device have the above-described configuration, even if the Express frame competes as in the first embodiment, the Express with a high priority is used. Frames can be cut-through output, and low-delay frame transfer that satisfies delay requirements is possible. Furthermore, when a high priority frame arrives later for a low priority frame from the same reception port for a single transmission port, the high priority frame can be output first.
  • 1 communication system 1 communication system, 2 communication device, 3 communication path, 4 communication frame transfer device, 10 receiver, 11 reception MAC unit, 20 transmitter, 21 transmission MAC unit, 30 Express transmission queue, 31 reception port dedicated queue, 32 priority Dedicated queue, 40 Normal transmission queue, 50 Read queue management unit, 51 Time information management unit, 52 Frame priority management unit, 53 Read queue determination unit, 60 Destination search unit, 70 Destination port distribution unit, 71 Destination port distribution Section, 510 time information counter, 511 register, 520 priority management section, 521 priority priority queue, 531 reception time comparison section, 542 priority comparison section, 533 read queue determination calculation section

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  • Communication Control (AREA)

Abstract

L'invention concerne un dispositif de transfert de trames de communication permettant de transférer des trames de communication reçues en provenance d'un dispositif de communication vers un autre dispositif de communication, et qui comprend : une file d'attente de transmission qui stocke, conformément à des ports d'émission et de réception, des trames à faible latence ; une unité de gestion de file d'attente de lecture, qui détermine un ordre de sortie sur la base des niveaux de priorité de trame et des temps de réception des trames à faible latence ; et un émetteur, qui lit et transmet au dispositif de communication les trames à faible latence provenant des files d'attente de transmission selon l'ordre de sortie déterminé par l'unité de gestion de file d'attente de lecture. De cette manière, lorsqu'une pluralité de trames à faible latence comportant différents niveaux de priorité de trame sont en conflit les unes avec les autres au même port de transmission, une commande de sortie basée sur les niveaux de priorité des trames peut être mise en oeuvre afin d'assurer un transfert à faible latence qui satisfait les demandes de latence des trames à faible latence respectives.
PCT/JP2015/000828 2015-02-20 2015-02-20 Dispositif de transfert de trames de communication et système de communication WO2016132402A1 (fr)

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PCT/JP2015/000828 WO2016132402A1 (fr) 2015-02-20 2015-02-20 Dispositif de transfert de trames de communication et système de communication
TW104110391A TWI555358B (zh) 2015-02-20 2015-03-31 Communication frame transfer device and communication system

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PCT/JP2015/000828 WO2016132402A1 (fr) 2015-02-20 2015-02-20 Dispositif de transfert de trames de communication et système de communication

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JPWO2020136843A1 (ja) * 2018-12-27 2021-03-11 三菱電機株式会社 中継装置、中継方法及び中継プログラム
JP2022543206A (ja) * 2019-07-26 2022-10-11 華為技術有限公司 データ送信方法及び装置
JP7394960B2 (ja) 2019-07-26 2023-12-08 華為技術有限公司 データ送信方法及び装置
US12003319B2 (en) 2019-07-26 2024-06-04 Huawei Technologies Co., Ltd. Data transmission method and apparatus

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